Crouching down beneath the Cloak, he placed the Decoy Detonator on the ground.

Harry took a look through it and saw that they were all still gathered around the Decoy Detonator.

The pamphlet-makers were still clustered around the remains of the Decoy Detonator, which continued to hoot feebly as it smoked.

"Robes," she said under her breath, acknowledging their presence with a nervous nod and continuing to poke around in her beaded bag, "Polyjuice Potion … Invisibility Cloak … Decoy Detonators … You should each take a couple just in case … Puking Pastilles, Nosebleed Norgat, Extendable Ears …"

However, you must plant the idea of decoys; that, I think, ought to ensure Harry’s safety.

His mind grappled with possibilities as he crept down them: He still had a couple of Decoy Detonators, but perhaps it would be better to simply knock on the courtroom door, enter as Runcorn, and ask for a quick word with Mafalda?

"You will suggest to the Order of the Phoenix," Snape murmured, "that they use decoys.